linux-kernel - [PATCH] arm64: dts: qcom: qcm6490-fairphone-fp5: Add thermistor for UFS/RAM

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Message-Id: <20241002-fp5-ufs-therm-v1-1-1d2d8c1f08b5@fairphone.com>
Date: Wed, 02 Oct 2024 15:01:08 +0200
From: Luca Weiss <luca.weiss@...rphone.com>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH] arm64: dts: qcom: qcm6490-fairphone-fp5: Add thermistor
 for UFS/RAM

Configure the ADC and thermal zone for the thermistor next to the
UFS+RAM chip which is connected to GPIO_12 of PM7250B. It is used to
measure the temperature of that area of the PCB.

Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
 arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
index 8ab30c01712e0b7c0cc1b403e0fe01650315b9e2..fdc62f1b1c5a398abaa71818fdf2858fdc445d28 100644
--- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
+++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
@@ -207,6 +207,20 @@ active-config0 {
 			};
 		};
 
+		mem-thermal {
+			polling-delay-passive = <0>;
+
+			thermal-sensors = <&pm7250b_adc_tm 2>;
+
+			trips {
+				active-config0 {
+					temperature = <125000>;
+					hysteresis = <1000>;
+					type = "passive";
+				};
+			};
+		};
+
 		pm8008-thermal {
 			polling-delay-passive = <100>;
 			thermal-sensors = <&pm8008>;
@@ -679,6 +693,9 @@ &ipa {
 };
 
 &pm7250b_adc {
+	pinctrl-0 = <&pm7250b_adc_default>;
+	pinctrl-names = "default";
+
 	channel@4d {
 		reg = <ADC5_AMUX_THM1_100K_PU>;
 		qcom,ratiometric;
@@ -694,6 +711,14 @@ channel@4f {
 		qcom,pre-scaling = <1 1>;
 		label = "conn_therm";
 	};
+
+	channel@53 {
+		reg = <ADC5_GPIO2_100K_PU>;
+		qcom,ratiometric;
+		qcom,hw-settle-time = <200>;
+		qcom,pre-scaling = <1 1>;
+		label = "mem_therm";
+	};
 };
 
 &pm7250b_adc_tm {
@@ -712,6 +737,21 @@ conn-therm@1 {
 		qcom,ratiometric;
 		qcom,hw-settle-time-us = <200>;
 	};
+
+	mem-therm@2 {
+		reg = <2>;
+		io-channels = <&pm7250b_adc ADC5_GPIO2_100K_PU>;
+		qcom,ratiometric;
+		qcom,hw-settle-time-us = <200>;
+	};
+};
+
+&pm7250b_gpios {
+	pm7250b_adc_default: adc-default-state {
+		pins = "gpio12";
+		function = PMIC_GPIO_FUNC_NORMAL;
+		bias-high-impedance;
+	};
 };
 
 &pm7325_gpios {

---
base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc
change-id: 20241002-fp5-ufs-therm-0f1649d5d212

Best regards,
-- 
Luca Weiss <luca.weiss@...rphone.com>